Heitrin (Terazosin Hydrochloride Dihydrate)

Heitrin is indicated for two primary therapeutic areas, providing clinicians with a single agent for related conditions.

• Management of hypertension by reducing peripheral vascular resistance.
• Relief of urinary obstruction symptoms caused by benign prostatic hyperplasia.
• Adjunct therapy in patients with coexisting hypertension and BPH.
• Long‑term blood pressure control when lifestyle measures are insufficient.
• Use in patients who require a once‑daily oral alpha‑1 blocker.

Side effects of Heitrin vary in frequency and severity. Patients should be aware of both common and less frequent reactions.

Common

• Dizziness or light‑headedness, especially after the first dose.
• Headache.
• Fatigue or tiredness.
• Nasal congestion.
• Swelling of the ankles or feet.
• Nausea.

Serious

• Severe hypotension leading to fainting.
• Priapism (prolonged erection).
• Persistent or worsening urinary retention.
• Allergic reactions such as rash, itching, or swelling of the face.
• Rapid heart rate (tachycardia).

Before starting Heitrin, certain health considerations should be reviewed to minimize risks.

• Assess baseline blood pressure and monitor for orthostatic changes.
• Evaluate renal and hepatic function, as dosage adjustments may be needed.
• Use caution in patients with a history of cardiovascular disease or heart failure.
• Discuss any history of prostate surgery or severe urinary obstruction.
• Inform the prescriber about all current medications, including over‑the‑counter products.
• Pregnant or breastfeeding individuals should consult a healthcare professional before use.
• Discontinue use gradually under medical guidance to avoid rebound hypertension.

Heitrin can interact with several drug classes, affecting its efficacy or safety profile.

Avoid

• Other antihypertensive agents (e.g., beta‑blockers, ACE inhibitors) that may cause additive blood pressure lowering.
• Phosphodiesterase‑5 inhibitors (e.g., sildenafil) due to risk of severe hypotension.
• Strong CYP3A4 inhibitors that could increase terazosin plasma levels.

Use with caution

• Diuretics, which may enhance orthostatic hypotension.
• Non‑steroidal anti‑inflammatory drugs (NSAIDs) that can affect renal function.
• Medications that prolong the QT interval.
• Herbal supplements such as St. John’s wort that induce CYP enzymes.